package com.easy.util;

import java.util.Map;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

public class ExpiryMap {
    //用来存储数据的容器
    private java.util.Map<String, Object> map = new java.util.HashMap<String, Object>();
    //用来存储数据的有效期
    private Map<String, Long> expiryMap = new java.util.HashMap<String, Long>();
    //检查过去线程(池)
    private ScheduledExecutorService service = Executors.newSingleThreadScheduledExecutor();
    //检查周期
    private long expiryTime = 1000 * 6;
    public ExpiryMap(){
        service.scheduleAtFixedRate(this::clearExpiry, expiryTime, expiryTime, TimeUnit.MILLISECONDS);
    }
    public ExpiryMap(long expiryTime){
        this.expiryTime = expiryTime;
        service.scheduleAtFixedRate(this::clearExpiry, expiryTime, expiryTime, TimeUnit.MILLISECONDS);
    }

    public void put(String key, Object value){
        map.put(key, value);
        expiryMap.put(key, System.currentTimeMillis() + expiryTime);
    }

    public void put(String key, Object value,long expiryTime){
        map.put(key, value);
        expiryMap.put(key, System.currentTimeMillis() + expiryTime);
    }

    public Object get(String key){
        if(expiryMap.get(key) < System.currentTimeMillis()){
            map.remove(key);
            expiryMap.remove(key);
        }
        return map.get( key);
    }

    public void remove(String key){
        map.remove(key);
        expiryMap.remove(key);
    }

    public boolean containsKey(String key){
        if(expiryMap.get(key) < System.currentTimeMillis()){
            map.remove(key);
            expiryMap.remove(key);
        }
        return map.containsKey(key);
    }
    //清除过期数据
    public void clearExpiry(){
        for(String key:expiryMap.keySet()){
            if(expiryMap.get(key) < System.currentTimeMillis()){
                map.remove(key);
                expiryMap.remove(key);
            }
        }
    }
}
